Update pycodestyle from 2.6.0 to 2.7.0 (#28070)

Co-authored-by: Stephen McGruer <smcgruer@chromium.org>
diff --git a/tools/requirements_flake8.txt b/tools/requirements_flake8.txt
index 02094b6..e3eb891 100644
--- a/tools/requirements_flake8.txt
+++ b/tools/requirements_flake8.txt
@@ -1,4 +1,4 @@
 flake8==3.9.0
-pycodestyle==2.6.0
+pycodestyle==2.7.0
 pyflakes==2.3.0
 pep8-naming==0.11.1